Park Tool DAG-2 Derailleur Hanger Alignment Gauge

An updated version of the popular DAG-1, the new Park Tool DAG-2 Derailleur Hanger Alignment Gauge utilizes a longer measuring pointer, longer threaded stud and a longer, narrower alignment boss to fit a wider variety of bikes.

Solves a multitude of derailleur shifting problems, most notably with index shifting systems

Extremely steady in operation and simple to use

Threads directly into the derailleur hanger

Gauge bar holds a gauge which marks the distance to the wheel

Gauge then is rotated with the wheel to the 3, 6, 9, and 12 o'clock positions, noting any differences in measurements

Alignment of the derailleur hanger is accomplished by applying pressure to the tool's arm - the results can be checked instantly